| 1．Karasu River (Gunma) |
| The Karasu River (烏川, Karasu-gawa) is a river located in Gunma Prefecture, Japan. It is a branch of the Tone River and the government of Japan classifies it as a Class 1 river. It generally flows in a south-easterly direction. The river passes through or forms the boundary of the following communities: |
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| 2．Watarase River |
| The Watarase River (渡良瀬川, Watarase-gawa) is a major river in the northern Kantō region of Japan. A tributary of the Tone River, it is 106.7 kilometres (66.3 mi) in length and drains an area of 2,621 square kilometres (1,012 sq mi).[1] Its source is at Mount Sukai on the boundary of the city of Nikkō in Tochigi Prefecture and it empties into the Tone River at the boundary of the city of Koga in Ibaraki Prefecture and the city of Kazo in Saitama Prefecture. It is classed as a First-class river by the Japanese government. |
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| 3．Agatsuma River |
| The Agatsuma River (吾妻川, Agatsuma-gawa) is a major river in the northern Kantō region of Japan. It is 76.22 kilometres (47.36 mi) in length and has a basin area of 1,366 square kilometres (527 sq mi). Located entirely within Gunma Prefecture, it is one of the prefecture's major rivers. It is also a major tributary of the Tone River. The river is an important source of hydroelectric power, and 17 power plants are located on its banks.[1] |
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| 4．Tone River |
| The Tone River (利根川, Tone-gawa) is a river in the Kantō region of Japan. It is 322 kilometers (200 mi) in length (the second longest in Japan after the Shinano) and has a drainage area of 16,840 square kilometers (6,500 sq mi) (the largest in Japan). It is nicknamed Bandō Tarō (坂東太郎); Bandō is an obsolete alias of the Kantō Region, and Tarō is a popular given name for an oldest son.[1] It is regarded as one of the "Three Greatest Rivers" of Japan, the others being the Yoshino in Shikoku and the Chikugo in Kyūshū. |
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